JP2008532071A5 - - Google Patents

Claims (10)

A toric contact lens design comprising a central optical zone, a vertical meridian, a transition zone surrounding the central optical zone, a carrier extending outward from the transition zone, and a plurality of thickness zones in the carrier,
The plurality of thickness zones includes at least three thickness zones, and a second thickness zone of the three thickness zones is symmetrical on both sides of the lens design across a vertical meridian, and a second thickness The design is characterized by a relatively consistent thickness section for each meridian within the thickness zone.   The design of claim 1, wherein the first and third thickness zones of the three thickness zones are at the top and bottom of the lens design.   The design of claim 1, wherein the boundary between the first zone and the second zone is at least 15 ° from the vertical meridian.   The design of claim 1, wherein the boundary between the third zone and the second zone is at least 30 ° from the vertical meridian.   The design of claim 1, wherein the thickness profile of the second zone increases from its upper boundary to its lower boundary.   The design of claim 1, wherein the slope of the thickness profile of the second zone gradually increases and then decreases from the upper boundary to the lower boundary.   The design of claim 1, wherein the relatively consistent thickness section width is at least 30% of the zone width.   The design of claim 1, wherein the thickness change in the relatively consistent thickness section is 10% or less of the maximum thickness at the meridian. The design of claim 1, wherein the thickness profile range from the upper boundary to the lower boundary of the second zone is 0.065 mm to 0.45 mm.   A contact lens having a toric contact lens design according to claim 1, preferably a soft contact lens.